An airplane factory manufactures airplane engine. The Unit cost c ( the cost in dollars to make each airplane engine) depends on the number of engines made. If x engines are made, then the Unit cost is given by the function c (x)-0.9x2 -306x +34.590. What is the minimum unit cost? Do not round your answer

According to the normal model, what percent of receivers would you expect to gain fewer yards than 2 standard deviations below the mean number of yards

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297